a bus is moving with the velociity of 36 km/hr . after seeing a boy at 20 m ahead on the road, the driver applies the brake and the bus gets stopped at 10 m distance. Now, calculate acceleration as well as time taken by this bus to stop.

Assumption: the acceleration of this bus is constant while the brake was applied.

Acceleration of this bus: approximately .

It took the bus approximately to come to a stop.

Explanation:

Quantities:

Consider the following SUVAT equation:

.

On the other hand, assume that the acceleration of this bus is indeed constant. Given the initial and final velocity, the time it took for the bus to stop would be inversely proportional to the acceleration of this bus. That is:

.

Therefore, replace the quantity with the expression in that SUVAT equation:

.

Simplify this equation:

.

Therefore, .

In this question, the value of , , and are already known:

Substitute these quantities into this equation to find the value of :

.

(The value of acceleration is less than zero because the velocity of the bus was getting smaller.)

Substitute (alongside and ) to estimate the time required for the bus to come to a stop:

.

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2